材料科学
结晶
硫脲
能量转换效率
钙钛矿(结构)
结晶度
钝化
化学工程
晶体生长
成核
嵌入
纳米技术
光电子学
结晶学
复合材料
有机化学
计算机科学
工程类
化学
图层(电子)
人工智能
作者
Qihang Sun,Binyang Tuo,Ziqiu Ren,Tangyue Xue,Yiqiang Zhang,Junjie Ma,Pengwei Li,Yanlin Song
标识
DOI:10.1002/adfm.202208885
摘要
Abstract The solution process of perovskite solar cells may lead to widespread defects in the device, causing severe nonradiative recombination and the loss of conversion efficiency. Herein, a strategy of embedding thiourea into perovskite to manipulate the crystallization process and passivate the defects simultaneously is demonstrated. A competitive crystallization mechanism by embedding thiourea into perovskite has been proposed for the improvement of morphology and crystallinity. The defects in the device have been dramatically decreased by the strong coordination of CS bond in thiourea with the undercoordinated Pb 2+ . Moreover, the bilateral affinity of thiourea to the SnO 2 and perovskite can enhance the interface contact by the bridging bonding, which will release the residual stress of perovskite films. As a result, the thiourea‐embedding device achieves a power conversion efficiency over 24% and shows excellent storage and illumination stabilities. Even undergoing 3768 h storage, the maximum efficiency value of unencapsulated device keeps over 94%. Furthermore, the efficiency of the optimized device maintains over 80% after 120 h continuous illumination at 60 °C.
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